BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 14, 2011  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
THUNDERSTORMS YESTERDAY AND EARLY THIS MORNING
BRING DOWNPOURS OF RAIN TOTALING 1.10 INCHES
 
A late afternoon thunderstorm yesterday brought
a downpour of rain amounting to 0.51 inch in
20 minutes ending at 4:56 p.m. and 0.68 inch in
45 minutes ending at 5:25 p.m.  The maximum
precipitation in 60 minutes was 0.69 inch in
the hour ending at 5:25 p.m.  The total for
the calendar day was 0.73 inch. 
Early this morning more thunderstorm activity
brought a couple more hours of moderate to heavy
showery rainfall totaling 0.35 inch. 
There were no significant wind gusts or cloud
to ground lightning but rather considerable lightning
in cloud and cloud to cloud.
Temperatures cooled quickly with the rainfall
yesterday from an afternoon high of 85F all the way
down to 61F by midnight EST and on down to 58F
early this morning.
 
Today's observations:
 
7 A.M.  
Weather: Thin scattered cirrus layer N-ESE. Few distant
stratocumulus all quadrants with moderate tops. Few altocumulus
W and E. Few altocumulus from the spreading out of cumulus NE-E.
Light distant haze.
Temperature: 61F, Dew point: 54F; Wind: NNE at 9 kts
Wind: Direction variable NNW-ENE, gust of 21 kts past hour
Sea-level pressure: 29.96 inches Hg, rising 
Visibility: 35 miles, light distant haze
6-hour min. temp: 58F
24-hour rainfall: 1.10 ins. 
BHO SA 1155 250 –SCT 35 147/61/54/0209/996/
FEW SC ALQDS MDT TOPS DSNT W FEW ACSL W AND E
FEW ACC NE-E CI LYR N-ESE LGT DSNT HZ GST 21 KTS PST HR
WND 34V06/ 8/541 52011 ASOS 70110 MANUAL 70110 10062 20058
 
10 A.M.
Weather: Scattered cumulus. Few moderate cumulus, few
altocumulus standing lenticularis and altocumulus from the
spreading out of cumulus. Cirrus distant to the NE-E.  
Temperature: 67F, Dew Point: 56F;  Wind: NE at 9 kts
Wind: Direction variable N-E
Sea-level pressure: 30.00 inches Hg, rising
Visibility: 55 miles, NW 70 miles
BHO SA 1455 32 SCT 45 SCT 70 SCT 250 SCT 55 160/67/56/0509/000/
FEW MDT CU FEW SCCU FEW ACSL/ACC CI DSNT NE-E VSBY NW 70 WND 36V09/
8/281 51013
 
1 P.M.
Weather: Clear, cumulus/moderate cumulus except overhead and NE-E.
Cirrus and dense cirrus layer distant to the NE-ESE. 
Temperature: 70F, Dew Point: 57F;  Wind: NE at 10G18 kts
Wind: Direction variable N-E
Sea-level pressure: 30.02 inches Hg, rising
Visibility: 60 miles, NW 70 miles 
6-hour max. temp: 70F 
BHO SA 1755 CLR 60 166/70/57/0410G18/002/ CU/MDT CU XCPT OVHD-NE-E
CI/DNS CI LYR DSNT NE-ESE VSBY NW 70 WND 01V08/ 8/202 51003 10070 20061
 
WEATHER SUMMARY FOR WEDNESDAY, JULY 13
 
TEMPERATURE (DEGREES F)
MAX.....85    NORMAL.....81
MIN.....61    NORMAL.....62
MEAN....73    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL....................+1
TOTAL DEPARTURE FOR THE MONTH...................+43 [+3.1 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............21 NE  AT  10:16 P.M.
                   AEROVANE...............25 NE  AT  10:16 P.M.
                   ASOS...................22 NE  AT  10:16 P.M.
                   DAVIS..................22 WNW AT  4:48 A.M.
THE FASTEST MILE FOR YESTERDAY............17 WNW AT  2:23 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.............15 NNE AT  9:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............18 W   AT  3:26 A.M.
AVERAGE WIND SPEED AND DIRECTION........9.0 WNW
                   ASOS.................8.9
                   DAVIS................9.6 NW [310 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.10  DEPARTURE.........+0.98
                         ASOS..............1.10  
TOTAL PRECIPITATION FOR THE MONTH..........1.71  DEPARTURE.........+0.13
                         ASOS..............1.71
TOTAL PRECIPITATION FOR THE YEAR..........27.92  DEPARTURE.........+1.77
                        ASOS..............28.47**
**ASOS data is in error due to system failure on 1/12-13
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2011 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
7/1  78/59/69/-1/0.01/530/58         15 WNW
7/2  80/61/71/+1/0.00/603/66         17 SE
7/3  79/64/72/+2/0.02/018/02         22 S
7/4  86/68/76/+6/0.00/583/64         18 SW
7/5  89/66/78/+7/0.00/784/86         15 S
7/6  88/68/78/+7/T/792/87            30 WNW AERO 35 MPH TSTM
7/7  86/67/77/+6/0.00/481/53         17 WNW
7/8  74/65/70/-1/0.47/027/03         16 ESE TSTM
7/9  81/63/72/+1/0.11/698/77         29 WNW
7/10 83/59/71/0/0.00/860/95          21 SSW
7/11 89/65/77/+5/0.00/814/90         23 S
7/12 90/72/83/+9/0.00/777/86         25 W
7/13 85/61/73/+1/0.73/.../..         21 NE
 
7/14 our morning low temp: 58F; the normal low is 62F 
 
DAILY RECORDS FOR JULY 2011
None so far...
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 1.97 INS IN 1960
WIND 110e MPH NW IN 1942 [RECORD FOR MONTH]
 
RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002
 
TODAY'S REPORT PREPARED BY: Robert Skilling/George Tabeek